"I was just trying to enjoy every point", said Kerber after ending unseeded Sharapova's run in only her second Grand Slam tournament back since serving a 15-month doping ban.
"I think I deserved to smile out there after that victory".
Kerber, the 2016 champion, is so unassuming and wary of the limelight that she never seemed less happy than when ranked No 1.
She carried that form into her first-round clash with fellow German Anna-Lena Friedsam, winning 6-0 6-4.
The match was originally scheduled for Rod Laver Arena, but was moved to Margaret Court Arena due to a backlog of long matches at the larger venue.
The 30-year-old still finds herself being questioned all the time about her 15-month absence and the repercussions from it but Sharapova is settling back into the routine of grand slam tennis.
After the injury timeout, Djokovic went on to break his rival's next serve, getting a 4-1 advantage that he built on to seal the second set against Viñolas, who was making his first appearance in the Australian Open third round.
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The standout match on Saturday saw top seed Simona Halep save three match points to win an epic against Lauren Davis.
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In what was expected to be a tight affair, Del Potro (12) disappointed in a 6-3 6-3 6-2 loss to Tomas Berdych (19).
Sharapova finally got on the board, but flawless Kerber was finding winners nearly at will and broke again to take a 4-1 advantage in just 23 minutes.
Should Djokovic beat Chung he is facing a potential quarter-final against Austria's fifth seed Dominic Thiem, who must first get past American surprise packet Tennys Sandgren on Monday.
He continued to hobble and stretch his left leg following the treatment but fought off four break points for Vinolas-Ramos at 4-2 in the second set to maintain his advantage, after which the match always looked to be going in Djokovic's favour.
She will next face French eighth seed Caroline Garcia, who was too strong for Belarussian Alaksandra Sasnovich.
"I told him for about six games to turn the lights on because it was cloudy, it was dark", he said.